Title:
FILTER TUNING DEVICE AND TUNING PLATE INCLUDING A NUMBER OF SUCH DEVICES
Document Type and Number:
WIPO Patent Application WO1998054783
Kind Code:
A3
Abstract:
The present invention relates to a tuning device in radio filter equipment for mobile telephony in which one or more cavities in the equipment should be tuned to the right frequency. The invention also relates to a tuning plate including a number of such tuning devices. The tuning device preferably includes regular or square formed depressed parts in the tuning plate. The depressed part converges each to a square formed central plate which is provided with an elevation or bulb. By turning a tuning screw on the equipment a force is developed on the plate and the surrounding depressed parts. This implies that the tuning can be made automatically, more secure and with less risk for intermodulation.
Inventors:
HENNINGSSON BO UNO EGON
LINDELL SVEN PATRIK
LINDELL SVEN PATRIK
Application Number:
PCT/SE1998/000918
Publication Date:
March 04, 1999
Filing Date:
May 15, 1998
Export Citation:
Assignee:
ERICSSON TELEFON AB L M (SE)
International Classes:
H01P1/205; H01P7/04; (IPC1-7): H01P7/06; H01P1/211
Foreign References:
| US3798565A | 1974-03-19 | |||
| DE3935785A1 | 1991-05-02 | |||
| DE4113302A1 | 1992-10-29 | |||
| EP0519308A2 | 1992-12-23 | |||
| EP0540360A1 | 1993-05-05 |
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